Heat exchanger having parallel connected refrigerant coil pipes

ABSTRACT

A heat exchanger having refrigerant coil pipes connected in parallel is disclosed. The heat exchanger has a plurality of heat dissipating fins and a plurality of layers of refrigerant coil pipes which pass through the fins transversally. The plurality of refrigerant coil pipes are connected in parallel and then high pressure refrigerant driving by an air compressor is force into the refrigerant coil pipes. Air channels are formed between the refrigerant coil pipes and the fins.

FIELD OF THE INVENTION

[0001] The present invention relates to heat exchangers utilized in refrigerators or air conditioners, and particularly to a heat exchanger having refrigerant coil pipes connected in parallel which can improve the efficiency of refrigerators or air conditioners.

BACKGROUND OF THE INVENTION

[0002] One prior art gas-cooling condenser air conditioners used in the prior art air conditioner is illustrated in FIG. 1. The condenser is mainly formed a plurality of fins which are arranged in parallel. The refrigerant coil pipes are transversally arranged. Only one refrigerant coil pipe is used, which are reciprocally wound. The high pressure refrigerant compressed by an air compressor is guided from an upper side of the condenser into the refrigerant coil pipe so as to flow downwards for being condensed. The condensed process, a motor is used to drive the fan so that outer air is guided into the space between the refrigerant coil pipes in the condenser and then heat is transferred from the fins and refrigerant coil pipe. The exhausting heat from the condenser and the refrigerant are absorbed by the air and then is exhausted with the air.

[0003] However, the above mentioned refrigerant coil pipe has the following disadvantages:

[0004] 1. Only one refrigerant coil pipe is used. High pressure gasified refrigerant is filled into the tube from the upper side thereof, while as the refrigerant flow to the rear section of the refrigerant coil pipe (about ⅙ or ¼ of the whole length distanced from the distal end of the tube), the refrigerant tube is almost liquefied. The cooling energy is consumed and since the tube is too long so that the fiction with the wall of tube will consume the energy of the refrigerant.

[0005] 2. Too many bending portions of the refrigerant coil pipes cause the power to be further consumed.

[0006] For a long time, the manufacturers are make their efforts to develop more efficient condensers, and thus water-cooled and vaporized heated exchangers are developed. However, the EER value is still confined in about 2.0. It is difficult to be improved.

SUMMARY OF THE INVENTION

[0007] Accordingly, the primary object of the present invention is to provide a heat exchanger having refrigerant coil pipes connected in parallel, wherein parallel connected coil pipes are used to replace a single one coil pipe. Thereby, the refrigerant tube in a plurality of tubes are condensed at the same time so that the condensing capacity per unit time is increased, i.e., the condensing speed is increased without increasing the applied pressure. Thereby, the condensing speed is increased and the power is saved. The pressure of a compressor is unnecessary to be reduced. Thereby, the present invention is a novel method for improving EER.

[0008] Another object of the present invention is to provide a heat exchanger having refrigerant coil pipes connected in parallel, wherein inlets of the refrigerant guide-in pipes are connected in parallel. The high temperature and high pressure from the air compressor is driven downwards into a refrigerant guide-out pipe and then into a plurality of refrigerant coil pipes. After the refrigerant is condensed in the refrigerant coil pipes, the liquefied refrigerant flows out from a refrigerant guide-out pipe and then to an expansion valve.

[0009] The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing.

BRIEF DESCRIPTION OF THE DRAWINGS

[0010]FIG. 1 is a schematic view of a prior art fin type condenser.

[0011]FIG. 2 is a schematic view of a fin type heat exchanger of the present invention.

[0012]FIG. 2A is a schematic perspective view of the fin type heat exchanger of the present invention.

[0013]FIG. 3 is a front perspective view of the fin type heat exchanger of the present invention.

[0014]FIG. 4 shows an application of the fin type heat exchanger of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The objects, features and effects of the present invention will be described hereinafter by various embodiments and drawings. However, the present invention is not confined by those described herein. Other embodiments modified from the following description are within the spirits and scopes of the present invention. Therefore, the present invention is defined by the appended claims.

[0016] Referring to FIGS. 2 and 3, the heat exchanger of the present invention is a fin type heat exchanger 10. In the heat exchanger, a refrigerant tubes 122 passes through a plurality of fins 110 which are arranged longitudinally. The refrigerant tubes 122 are serially connected transversally so as to form a plurality of layers of refrigerant coil pipes 120. Inlets of the refrigerant coil pipes 120 are parallelly connected to a refrigerant guide-in pipe 124. The high pressure and high temperature refrigerant enters into the refrigerant guide-in pipe 124 and then flows into each layer of refrigerant coil pipe. Namely, the refrigerant guide-in pipes 124 are connected in parallel instead of only one refrigerant guide-in pipe being used. Therefore, the refrigerant in the plurality of refrigerant guide-in pipes is condensed at the same time so that the volume of condensing fluid is increased. That is to say, the condensing speed is increased without needing to increase the applied pressure. Thereby, power is saved by high speed condensing (the condensing fluid per unit time is increased).

[0017] Referring to FIG. 2A, in this embodiment, a fin set having three rows is used as an example. Since the number of rows is small, to have a sufficient length to liquefy the refrigerant, in this embodiment, the upper and lower refrigerant tubes 122 are connected to one another and then are connected to an adjacent refrigerant tube 122. Therefore, the tube is wound three times so as to complete various layers of refrigerant coil pipes 120. It should be noted that the way of winding can be varied with the numbers of banks of the holes on the condenser. For example, when the number of banks is increased, the refrigerant tubes 122 of various banks can be serially connected directly, which is mainly determined according to the capacity of the condenser.

[0018] Referring to FIG. 4, an application of the condenser of the present invention is illustrated. A first and second heat exchangers 10, 10′ are installed. High pressure gasified refrigerant is driven to the first heat exchanger 10. After condensed, the refrigerant enters into the second heat exchanger 10′ for being further condensed.

[0019] A way of guiding the refrigerant out of the refrigerant coil pipe 120 of the fin type heat exchanger 10 will be illustrated in the following. The outlets of the various layers of refrigerant coil pipes 120 of the fin type heat exchanger 10 are connected in parallel to a refrigerant guide-out pipe 126 for collecting the condensed liquefying refrigerant. In another example illustrated by the second heat exchanger 10′, various of refrigerant guide-in pipes 120′ are grouped. The outlets of various groups are connected in parallel to a respective refrigerant guide-out pipe 126′. Then all the refrigerant guide-out pipes 126′ are collected.

[0020] In summary, in the present invention, parallel connected coil pipes are used to replace a single one coil pipe. Thereby, the refrigerant tube in a plurality of tubes are condensed at the same time so that the condensing capacity per unit time is increased, i.e., the condensing speed is increased without increasing the applied pressure. Thereby, the condensing speed is increased and the power is saved. The pressure of a compressor is unnecessary to be reduced. Thereby, the present invention is a novel method for improving EER.

[0021] The present invention is thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the present invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims. 

What is claimed is:
 1. A heat exchanger having refrigerant coil pipes connected in parallel; the heat exchanger having a plurality of heat dissipating fins and a plurality of layers of refrigerant coil pipes which pass through the fins transversally, characterized in that: the plurality of refrigerant coil pipes are connected in parallel and then high pressure refrigerant driving by an air compressor is force into the refrigerant coil pipes; and air channels are formed between the refrigerant coil pipes and the fins.
 2. The heat exchanger as claimed in claim 1, wherein inlets of various layers of refrigerant coil pipes are connected in parallel so that the high pressure refrigerant of the air compressor is driven into a refrigerant guide-in pipe and then further enters into the plurality of layers of refrigerant coil pipes.
 3. The heat exchanger as claimed in claim 1, wherein outlets of the plurality of layers of refrigerant coil pipes are connected in parallel for being collected, thereby, the condensed refrigerant is guided out.
 4. The heat exchanger as claimed in claim 1, wherein various of refrigerant guide-in pipes are grouped; outlets of various groups are connected in parallel to a respective refrigerant guide-out pipe; and then all the refrigerant guide-out pipes are collected. 